Verified DB2 repositories work with updated software.

After updating the software to IBM DB2 LUW v12.1.1 and GnuCOBOL to 3.2, I cloned and ran:

• ibm-gnu-DB2-First-Steps
• gem-gnu-DB2

to make sure they still work correctly.

Both did and I added:

• Some additional code to ibm-gnu-DB2-First-Steps:connectdb to make the tests more explicit.
• Updated the README.md with additional information.

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